text: // © 2016 and later: Unicode, Inc. and others.
  // License & terms of use: http://www.unicode.org/copyright.html
  /*
   **********************************************************************
   *   Copyright (C) 2005-2015, International Business Machines
   *   Corporation and others.  All Rights Reserved.
   **********************************************************************
   */
  
  #ifndef __CSR2022_H
  #define __CSR2022_H
  
  #include "unicode/utypes.h"
  
  #if !UCONFIG_NO_CONVERSION
  
  #include "csrecog.h"
  
  U_NAMESPACE_BEGIN
  
  class CharsetMatch;
  
  /**
   *  class CharsetRecog_2022  part of the ICU charset detection imlementation.
   *                           This is a superclass for the individual detectors for
   *                           each of the detectable members of the ISO 2022 family
   *                           of encodings.
   * 
   *                           The separate classes are nested within this class.
   * 
   * @internal
   */
  class CharsetRecog_2022 : public CharsetRecognizer
  {
  
  public:    
      virtual ~CharsetRecog_2022() = 0;
  
  protected:
  
      /**
       * Matching function shared among the 2022 detectors JP, CN and KR
       * Counts up the number of legal an unrecognized escape sequences in
       * the sample of text, and computes a score based on the total number &
       * the proportion that fit the encoding.
       * 
       * 
       * @param text the byte buffer containing text to analyse
       * @param textLen  the size of the text in the byte.
       * @param escapeSequences the byte escape sequences to test for.
       * @return match quality, in the range of 0-100.
       */
      int32_t match_2022(const uint8_t *text,
                         int32_t textLen,
                         const uint8_t escapeSequences[][5],
                         int32_t escapeSequences_length) const;
  
  };
  
  class CharsetRecog_2022JP :public CharsetRecog_2022
  {
  public:
      virtual ~CharsetRecog_2022JP();
  
      const char *getName() const;
  
      UBool match(InputText *textIn, CharsetMatch *results) const;
  };
  
  #if !UCONFIG_ONLY_HTML_CONVERSION
  class CharsetRecog_2022KR :public CharsetRecog_2022 {
  public:
      virtual ~CharsetRecog_2022KR();
  
      const char *getName() const;
  
      UBool match(InputText *textIn, CharsetMatch *results) const;
  
  };
  
  class CharsetRecog_2022CN :public CharsetRecog_2022
  {
  public:
      virtual ~CharsetRecog_2022CN();
  
      const char* getName() const;
  
      UBool match(InputText *textIn, CharsetMatch *results) const;
  };
  #endif
  
  U_NAMESPACE_END
  
  #endif
  #endif /* __CSR2022_H */
  